http://ggpo.net/download/ggpofba source code released, with documentation on ggponet.dll's functions. The api seems pretty intuitive, and people say that even an idiot could implement this into their emulator/game. I hope that developers of MAME++ and Supercade will pay attention to this (especially Supercade, which uses the same FBA emulator as GGPO), and overall I would like to see ggpo netplay replacing kaillera on all the emulators in nearest future